Module 2 OSPF Configuration for Training Lab Network

Transcription

1 APNIC IPv6/Routing Workshop Lab Module 2 OSPF Configuration for Training Lab Network Objective: All the workshop lab routers are configured with required basic & interface configuration according to the topology diagram below. Network level reachability testing between directly connected point-to-point links are successfully done in our previous module (Module 1). Participants will require to configure OSPF related configuration on this module for both IPv6 and IPv4 protocol. Workshop instructor will be presenting OSPF design goal & specification for this module. Workshop team has already been build and participants have got access to their designated routers. Prerequisites: Basic routing concept, IP addressing, Cisco router CLI, Telnet/SSH software etc. The following will be the common topology and IP address plan used for the labs. DNS MAIL WWW DNS MAIL WWW / :6400:8000::/ / :6400:9800::/ / :6400:e000::/ / :6400:f800::/48 CPE / :6400:10::/64 r13-car1 2 2 r14-cbr1 r20-cbr4 CPE / :6400::1/ / :6400::3/ / :6400:14::/ / :6400:28::/64 r19-car / :6400::10/ / :6400::12/ / :6400:2c::/64 Infra / :6400:e:2::/ / :6400:e:32::/ R1 R10 Infra R R / :6400:800::/ / :6400:e::/ / :6400:e:1::/ / :6400:e:30::/ / :6400:e:31::/64 e1/3 e1/3 4 4 R2 R / :6400:e00::/ / :6400::2/128 fa0/2 1 fa0/5 fa0/ / :6400::11/128 SW / :6400:3::/ / :6400:2::/48 AS17821 SW / :6400::5/128 fa0/2 1 fa0/5 fa0/ / :6400::8/ / :6400:a00::/39 R5 2 2 R8 3 3 e1/ e1/ / :6400:e:10::/ / :6400:e:11::/ / :6400:e:20::/ / :6400:e:21::/ / :6400:c00::/ Infra R4 R / :6400:e:12::/ R / :6400:e:22::/64 Infra CPE / :6400:18::/64 r15-car / :6400::4/ / :6400::6/ / :6400:1c::/64 r16-cbr / :6400:20::/64 r17-car / :6400::7/ / :6400::9/ R9 r18-cbr / :6400:24::/64 CPE / :6400:a000::/ / :6400:b800::/ / :6400:c000::/ / :6400:d800::/48 DNS MAIL WWW DNS MAIL WWW Figure 1 ISP Lab Topology 1 APNIC V2.0 Created: 02 June 2010 Updated: 29 July 2013 nurul/documents/traininglab/

2 Tuesday, August 27, 2013 Lab Notes This workshop is intended to be run on a real cisco routers or Dynamips server with the above lab topologies set up. The routers are using both IPv4 and IPv6 supported IOS software. Participants should do their workshop module two configuration to achieve following goals. 1. After finishing the required interface configuration in module one we only can ping those directly connected interfaces. Loopback, and point-to-point interfaces are still not reachable (ping) from remote routers. 2. For the scalability purpose of IGP (i.e. OSPF) it is advisable to advertise only infrastructure prefixes to OSPF. It includes loopback, infrastructure point-to-point, and transport prefixes only. Please note customer site point-to-point (i.e. link between R1 to r13-car1 etc) and data centre (i.e. R1 e1/3 etc) prefixes are not advertised to OSPF. Because it might restrict your network growth as it will cause the growth of your OSPF. 3. For the same purpose we are using hierarchical OSPF areas to create separate topology database for different regional networks. On all four core routers loopback address is published to OSPF area There will not be any OSPF protocol running with the customer routers. So no OSPF configuration is required on those. 5. After finishing OSPF configuration we would like to see following 26 new prefixes in all infrastructure routers routing table. Loopback Point-to-point Transport R1=> 2406:6400::1/128 R2-R1=> 2406:6400:e::/64 Purple=> 2406:6400:2::/48 R2=> 2406:6400::2/128 R2-R3=> 2406:6400:e:1::/64 Green=> 2406:6400:3::/48 R3=> 2406:6400::3/128 R1-R3=> 2406:6400:e:2::/64 R4=> 2406:6400::4/128 R5-R4=> 2406:6400:e:10::/64 R5=> 2406:6400::5/128 R5-R6=> 2406:6400:e:11::/64 R6=> 2406:6400::6/128 R4-R6=> 2406:6400:e:12::/64 R7=> 2406:6400::7/128 R8-R7=> 2406:6400:e:20::/64 R8=> 2406:6400::8/128 R8-R9=> 2406:6400:e:21::/64 R9=> 2406:6400::9/128 R7-R9=> 2406:6400:e:22::/64 R10=> 2406:6400::10/128 R11-R10=> 2406:6400:e:30::/64 R11=> 2406:6400::11/128 R11-R12=> 2406:6400:e:31::/64 R12=> 2406:6400::12/128 R11-R12=> 2406:6400:e:32::/64 6. Due to time restriction in workshop OSPF analysis and example will cover IPv6 prefixes only. You can check IPv4 prefixes for your own understanding purpose. 2

3 APNIC IPv6/Routing Workshop Lab Lab Exercise 1. IPv6 OSPF (OSPFv3) Configuration: This configuration on Cisco IOS can be done from interface configuration mode. This configuration will activate a separate OSPF process on your cisco router if you already have OSPFv2 running. For a dual stack router you need to run both OSPFv2 and v3 at the same time. Please notice OSPFv3 router ID which is still 32bit number. Example Config on a Router: To enter into a cisco router global configuration mode. interface We are using Ethernet interface which is broadcast multi-access type of network for OSPF. By default OSPF will automatically detect the interface type and elect DR/BDR. If we use this command then OSPF will consider it as point to point link and no DR/BDR will be elected. interface Interface loopback 0, and will be participating in OSPFv3 process ID area 1. Prefixes configured on these interfaces will be advertised. 2. IPv4 OSPF (OSPFv2) Configuration: This configuration can be done from the global configuration of mode of a Cisco router. Same process ID can be used but still it is unique because same process id is used for 2 different service i.e OSPFv2 and OSPFv3. Example Config on a Router: To enter into a cisco router global configuration mode. Create ospfv2 process Keep log of OSPF neighbour relationship status if it is changed Do not create hello message by default to all interface. This approach is very effective if we would like to build OSPF adjacency on the selected interface. Specially if there is an external facing interface and no OSPF routing to them. network area 0 Loopback interface is not generating any hello but adding prefixes to OSPF 3 APNIC V2.0 Created: 02 June 2010 Updated: 29 July 2013 nurul/documents/traininglab/

4 Tuesday, August 27, 2013 no passive-interface Interface will generate hello to build adjacency with connected link. network area 1 And advertise network mask to area 1. Wildcard mask is reverse to subnet mask. no passive-interface network area 1 no passive-interface network area 0 no passive-interface network area 0 int We are using Ethernet interface which is broadcast multi-access type of network for OSPF. By default OSPF will automatically detect the interface type and elect DR/BDR. If we use this command then OSPF will consider it as point to point link and no DR/BDR will be elected. int 3. Verify IPv6 OSPF Configuration: Example IPv6 protocol verification on a Router: sh ipv6 ospf neighbor [To check OSPFv3 neighbor table] sh ipv6 ospf database [To check OSPFv3 topology table] sh ipv6 route ospf [To check ipv6 routing table prefixes learn by OSPFv3] ping [router1.up to router12 loopback]!!!!! ping [all WAN interface & transport interface]!!!!! ping [any datacenter prefix]... ping [any customer prefix]... debug ipv6 ospf packet debug ipv6 ospf adj You need to replace router name with the loopback address. Please look at the topology diagram on page 1 for further detail. Example IPv4 protocol verification on a Router: sh ip ospf neighbor [To check OSPFv2 neighbor table] sh ip ospf database [To check OSPFv2 topology table] sh ip route ospf [To check ipv4 routing table prefixes learn by OSPFv2] ping [router1.up to router12 loopback]!!!!! ping [all WAN interface & transport interface]!!!!! ping [any datacenter prefix]... ping [any customer prefix]... debug ip ospf packet debug ip ospf adj END OF MODULE TWO Next pages for reference template used on different routers. 4

5 APNIC IPv6/Routing Workshop Lab Workshop templates for reference purpose only Configuration of OSPF in training ISP network Region1: OSPF Area 1 R / :6400:800::/ / :6400::1/ / / :6400:e:2:/ R / :6400:e::/ / :6400:e:1:/64 e1/3 R / :6400::2/ / :6400:2::/ / :6400:3::/ :6400::3/128 OSPF Area 0 fa0/5 IPv4 OSPF Conf Router1: S network area 1 no passive-interface network area 1 no passive-interface network area 1 int int 5 APNIC V2.0 Created: 02 June 2010 Updated: 29 July 2013 nurul/documents/traininglab/

6 Tuesday, August 27, 2013 IPv6 OSPF Conf Router1: interface interface IPv4 OSPF Conf Router2: network area 0 no passive-interface network area 1 no passive-interface network area 1 no passive-interface network area 0 no passive-interface network area 0 int int IPv6 OSPF Conf Router2: interface interface interface interface 6

7 APNIC IPv6/Routing Workshop Lab IPv4 OSPF Conf Router3: network area 1 no passive-interface network area 1 no passive-interface network area 1 int int IPv6 OSPF Conf Router3: interface interface 7 APNIC V2.0 Created: 02 June 2010 Updated: 29 July 2013 nurul/documents/traininglab/

8 Tuesday, August 27, 2013 Configuration of OSPF in training ISP network Region2: / :6400:a00::/64 OSPF Area / :6400:3::/48 OSPF Area / :6400:2::/ / :6400::5/128 fa0/2 R5 2 2 e1/ / :6400:e:10:/ / :6400:e:11:/64 R / :6400:e:12:/ R / :6400::4/ / :6400::6/128 fa0/5 IPv4 OSPF Conf Router4: network area 2 no passive-interface network area 2 no passive-interface network area 2 int int 8

9 APNIC IPv6/Routing Workshop Lab IPv6 OSPF Conf Router4: ipv6 ospf area 2 interface ipv6 ospf area 2 interface ipv6 ospf area 2 IPv4 OSPF Conf Router5: network area 0 no passive-interface network area 2 no passive-interface network area 2 no passive-interface network area 0 no passive-interface network area 0 int int IPv6 OSPF Conf Router5: interface interface interface ipv6 ospf area 2 interface ipv6 ospf area 2 9 APNIC V2.0 Created: 02 June 2010 Updated: 29 July 2013 nurul/documents/traininglab/

10 Tuesday, August 27, 2013 IPv4 OSPF Conf Router6: network area 2 no passive-interface network area 2 no passive-interface network area 2 int int IPv6 OSPF Conf Router6: ipv6 ospf area 2 interface ipv6 ospf area 2 interface ipv6 ospf area 2 10

11 Configuration of OSPF in training ISP network Region3: / :6400:2::/48 1 fa0/5 fa0/ / :6400:3::/48 OSPF Area / :6400::8/128 R e1/ / :6400:e:20:/ / :6400:e:21:/ / :6400:c00::/ R / :6400:e:22:/64 R9 APNIC IPv6/Routing Workshop Lab / :6400::7/ / :6400::9/128 OSPF Area 3 IPv4 OSPF Conf Router7: network area 3 no passive-interface network area 3 no passive-interface network area 3 int int 11 APNIC V2.0 Created: 02 June 2010 Updated: 29 July 2013 nurul/documents/traininglab/

12 Tuesday, August 27, 2013 IPv6 OSPF Conf Router7: ipv6 ospf area 3 interface ipv6 ospf area 3 interface ipv6 ospf area 3 IPv4 OSPF Conf Router8: network area 0 no passive-interface network area 3 no passive-interface network area 3 no passive-interface network area 0 no passive-interface network area 0 int int IPv6 OSPF Conf Router8: interface interface interface ipv6 ospf area 3 interface ipv6 ospf area 3 12

13 APNIC IPv6/Routing Workshop Lab IPv4 OSPF Conf Router9: network area 3 no passive-interface network area 3 no passive-interface network area 3 int int IPv6 OSPF Conf Router9: ipv6 ospf area 3 interface ipv6 ospf area 3 interface ipv6 ospf area 3 13 APNIC V2.0 Created: 02 June 2010 Updated: 29 July 2013 nurul/documents/traininglab/

14 Tuesday, August 27, 2013 Configuration of OSPF in training ISP network Region4: 1 SW / :6400::10/ / :6400::12/ / :6400:e:32:/ R R / :6400:e:30:/ / :6400:e:31:/64 e1/ / :6400:2::/ R / :6400:3::/48 fa0/8 OSPF Area / :6400::11/128 OSPF Area / :6400:e00::/64 IPv4 OSPF Conf Router10: network area 4 no passive-interface network area 4 no passive-interface network area 4 int int 14

15 APNIC IPv6/Routing Workshop Lab IPv6 OSPF Conf Router10: ipv6 ospf area 4 interface ipv6 ospf area 4 interface ipv6 ospf area 4 IPv4 OSPF Conf Router11: network area 0 no passive-interface network area 4 no passive-interface network area 4 no passive-interface network area 0 no passive-interface network area 0 int int IPv6 OSPF Conf Router11: interface interface interface ipv6 ospf area 4 interface ipv6 ospf area 4 15 APNIC V2.0 Created: 02 June 2010 Updated: 29 July 2013 nurul/documents/traininglab/

16 Tuesday, August 27, 2013 IPv4 OSPF Conf Router12: network area 4 no passive-interface network area 4 no passive-interface network area 4 int int IPv6 OSPF Conf Router12: ipv6 ospf area 4 interface ipv6 ospf area 4 interface ipv6 ospf area 4 16